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歡迎您訪問(wèn)數(shù)學(xué)考題練習(xí):下表給出的是關(guān)于一次函數(shù)y=kx+b的自變量x!

數(shù)學(xué)考題練習(xí):下表給出的是關(guān)于一次函數(shù)y=kx+b的自變量x

更新時(shí)間:2024-01-12 16:35:10作者:貝語(yǔ)網(wǎng)校

下表給出的是關(guān)于一次函數(shù)y=kx+b的自變量x及其對(duì)應(yīng)的函數(shù)值y的若干信息:則根據(jù)表格中的相關(guān)數(shù)據(jù)可以計(jì)算得到m的值是

x-101
y01m….

A.0

B.1

C.2

D.3

試題答案

C

試題解析

設(shè)一次函數(shù)解析式為y=kx+b(k≠0),將(-1,0)、(0,1)、(1,m)代入即可得出答案.

解答:設(shè)一次函數(shù)解析式為:y=kx+b(k≠0).

根據(jù)圖示知,該一次函數(shù)經(jīng)過(guò)點(diǎn)(-1,0)、(0,1),則

解得,;

∴該一次函數(shù)的解析式為y=x+1:

又∵該一次函數(shù)經(jīng)過(guò)點(diǎn)(1,m),

∴m=1+1=2,即m=2;

故選C.

點(diǎn)評(píng):本題考查待定系數(shù)法求函數(shù)解析式的知識(shí),比較簡(jiǎn)單,注意掌握待定系數(shù)法的運(yùn)用.

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